I have more questions for you guys! In the past I've always inflated my tires to 32 pounds despite the 35 "max" pressure listed on the tire. Now with the Caddy, the owner's manual recommends 30. On the tire it says 35! 30 seems awfully low to me, and my questions are: If I don't put the tires to 30, will the CCR still work properly? What do you put your tires at for pressure? I think putting them to higher pressure will give less rolling resistance, and therefore more mileage, but a rougher ride. Is there a risk of blowout at 30? Also, a tire guy told me that with a heavy car, you need tires with a stiff "sidewall" is there logic to that statement?::banghead2 